Country
Japan
Autonomous systems registered in Japan, largest IPv4 address space first.
Routed networks
744
of 1,307 registered
IPv4 addresses
187M
11,671 prefixes
IPv6 prefixes
1,436
JP
Networks
| AS | Network | IPv4 addresses | IPv4 prefixes | IPv6 prefixes | Upstreams | Downstreams |
|---|---|---|---|---|---|---|
| AS17676 | SoftBank Corp. | 49.65M | 482 | 3 | 19 | 185 |
| AS4713 | NTT DOCOMO BUSINESS,Inc. | 28.63M | 182 | 5 | 3 | 96 |
| AS2516 | KDDI CORPORATION | 18.15M | 560 | 9 | 23 | 152 |
| AS9824 | JCOM Co., Ltd. | 10.32M | 233 | 62 | 5 | 22 |
| AS2907 | Research Organization of Information and Systems, National Institute of Informatics | 8.96M | 666 | 2 | 14 | 96 |
| AS17506 | ARTERIA Networks Corporation | 5.51M | 40 | 1 | 1 | 1 |
| AS2497 | Internet Initiative Japan Inc. | 4.16M | 244 | 11 | 25 | 327 |
| AS2527 | Sony Network Communications Inc. | 3.87M | 74 | 2 | 9 | 3 |
| AS2518 | BIGLOBE Inc. | 3.67M | 33 | 2 | 13 | 38 |
| AS17511 | OPTAGE Inc. | 3.00M | 66 | 2 | 15 | 10 |
| AS9605 | NTT DOCOMO, INC. | 2.60M | 861 | 334 | 29 | 0 |
| AS9617 | JCOM Co., Ltd. | 2.33M | 85 | 33 | 1 | 0 |
| AS2514 | NTT PC Communications, Inc. | 2.33M | 161 | 4 | 9 | 4 |
| AS10013 | FreeBit Co.,Ltd. | 1.95M | 407 | 3 | 4 | 1 |
| AS4725 | SoftBank Corp. | 1.93M | 136 | 1 | 1 | 10 |
| AS4694 | IDC Frontier Inc. | 1.91M | 329 | 5 | 6 | 2 |
| AS10010 | TOKAI Communications Corporation | 1.64M | 186 | 7 | 12 | 37 |
| AS9595 | NTT-ME Corporation | 1.63M | 45 | 4 | 9 | 0 |
| AS2510 | FUJITSU LIMITED | 1.59M | 60 | 1 | 1 | 4 |
| AS18126 | Chubu Telecommunications Company, Inc. | 1.51M | 63 | 2 | 9 | 1 |
| AS2519 | ARTERIA Networks Corporation | 1.46M | 182 | 2 | 12 | 76 |
| AS4685 | Asahi Net | 1.28M | 62 | 2 | 11 | 0 |
| AS4721 | JCOM Co., Ltd. | 1.26M | 162 | 1 | 1 | 0 |
| AS18081 | Kintetsu Cable Network Co., Ltd. | 868K | 38 | 1 | 8 | 1 |
| AS7679 | QTnet,Inc. | 761K | 36 | 1 | 21 | 12 |
| AS7524 | ITEC HANKYU HANSHIN CO.,LTD. | 684K | 121 | 1 | 11 | 2 |
| AS7687 | TOYOTA SYSTEMS CORPORATION | 662K | 211 | 0 | 9 | 0 |
| AS131932 | JR East Information Systems Company | 655K | 71 | 0 | 2 | 0 |
| AS7522 | STNet, Incorporated | 595K | 54 | 1 | 28 | 3 |
| AS7671 | NTT SmartConnect Corporation | 458K | 61 | 2 | 4 | 2 |
| AS18077 | Yamaguchi Cable Vision Co.,Ltd | 449K | 54 | 1 | 9 | 0 |
| AS138384 | Rakuten Mobile Network, Inc. | 421K | 31 | 1 | 9 | 3 |
| AS9365 | its communications Inc. | 404K | 14 | 1 | 9 | 2 |
| AS18071 | Panasonic Information Systems Co., Ltd | 383K | 50 | 0 | 1 | 0 |
| AS7684 | SAKURA Internet Inc. | 369K | 51 | 1 | 2 | 0 |
| AS9370 | SAKURA Internet Inc. | 341K | 39 | 5 | 8 | 4 |
| AS9597 | KDDI Web Communications Inc. | 318K | 26 | 1 | 7 | 0 |
| AS9371 | SAKURA Internet Inc. | 307K | 22 | 1 | 5 | 3 |
| AS18144 | Enecom,Inc. | 292K | 22 | 1 | 1 | 0 |
| AS7506 | GMO Internet, Inc. | 269K | 98 | 6 | 8 | 4 |
| AS4673 | NTT DATA CORPORATION | 251K | 25 | 3 | 3 | 0 |
| AS9351 | ZTV CO.,LTD | 250K | 30 | 1 | 10 | 4 |
| AS2522 | Japan Network Information Center | 229K | 15 | 0 | 1 | 0 |
| AS131965 | Xserver Inc. | 218K | 60 | 2 | 6 | 0 |
| AS2506 | NTT business Solutions corporation | 217K | 15 | 1 | 2 | 0 |
| AS9619 | Sony Global Solutions Inc. | 202K | 9 | 4 | 4 | 0 |
| AS18124 | Okayama University of Science | 201K | 10 | 1 | 2 | 0 |
| AS2501 | The University of Tokyo | 201K | 4 | 2 | 2 | 0 |
| AS4686 | BEKKOAME INTERNET INC. | 200K | 65 | 1 | 1 | 0 |
| AS9354 | Community Network Center Inc. | 200K | 37 | 1 | 25 | 12 |
| AS23793 | National Institute of Advanced Industrial Science and Technology | 200K | 18 | 0 | 1 | 0 |
| AS18268 | Naganoken Kyodou Densan Co.Ltd. | 198K | 9 | 1 | 7 | 1 |
| AS7514 | Computer Engineering & Consulting, Ltd. | 196K | 22 | 1 | 5 | 0 |
| AS59108 | KATCH NETWORK INC. | 193K | 45 | 2 | 1 | 0 |
| AS131921 | GMO GlobalSign Holdings K.K. | 180K | 55 | 13 | 5 | 1 |
| AS17698 | COMMUNITY NETWORK CENTER INCORPORATED. | 174K | 37 | 0 | 1 | 0 |
| AS9614 | JCOM Marketing Co.,Ltd. | 166K | 25 | 0 | 1 | 0 |
| AS9374 | EDION Corporation | 166K | 22 | 1 | 8 | 0 |
| AS9622 | Kurashiki Cable TV | 158K | 50 | 1 | 8 | 3 |
| AS9997 | Suzuka Cable Co.,Ltd | 158K | 10 | 1 | 7 | 0 |
| AS10006 | SECOM Trust Systems Co.,Ltd. | 146K | 55 | 2 | 7 | 0 |
| AS23820 | Rakuten Group, Inc. | 144K | 11 | 6 | 8 | 1 |
| AS38631 | LY Corporation | 143K | 149 | 116 | 8 | 0 |
| AS18271 | Sojitz Tech Innovation Co., Ltd. | 139K | 6 | 0 | 2 | 0 |
| AS37918 | NTT, Inc. | 136K | 22 | 1 | 6 | 0 |
| AS17529 | STARCAT Co .,LTD. | 135K | 13 | 1 | 2 | 0 |
| AS18087 | Toyo University | 135K | 4 | 1 | 2 | 0 |
| AS63802 | Nippon Telegraph and Telephone East Corporation | 135K | 17 | 0 | 8 | 0 |
| AS7670 | Enecom,Inc. | 135K | 19 | 1 | 10 | 18 |
| AS2504 | Kyoto University | 132K | 4 | 0 | 1 | 0 |
| AS37917 | University of Tsukuba | 132K | 3 | 0 | 2 | 0 |
| AS17944 | Japan Weather Association | 132K | 5 | 1 | 4 | 0 |
| AS7509 | Hokkaido University | 131K | 3 | 0 | 1 | 0 |
| AS17687 | National University Corporation Nagoya University | 131K | 3 | 0 | 1 | 0 |
| AS131981 | Takushoku University | 131K | 6 | 0 | 2 | 0 |
| AS58652 | Kochi University | 131K | 5 | 0 | 1 | 0 |
| AS17701 | Seinan Gakuin University | 131K | 3 | 1 | 2 | 0 |
| AS38635 | Keio University | 131K | 2 | 2 | 2 | 0 |
| AS55379 | Hosei University | 131K | 3 | 1 | 1 | 0 |
| AS55390 | Tokyo University of Science | 131K | 3 | 1 | 2 | 0 |
| AS55904 | KOGAKUIN University | 131K | 3 | 1 | 2 | 0 |
| AS9355 | National Institute of Information and Communications Technology | 131K | 2 | 1 | 4 | 0 |
| AS17512 | Japan Airlines Co.,Ltd. | 131K | 3 | 0 | 1 | 0 |
| AS38641 | Osaka Sangyo University | 131K | 3 | 0 | 1 | 0 |
| AS59104 | Soka University | 131K | 3 | 0 | 2 | 0 |
| AS131919 | Meiji University | 131K | 3 | 0 | 2 | 0 |
| AS4729 | Japan Atomic Energy Agency | 131K | 2 | 0 | 1 | 0 |
| AS58647 | Kagawa University | 130K | 185 | 0 | 2 | 0 |
| AS58791 | GMO Internet, Inc. | 129K | 181 | 2 | 5 | 2 |
| AS7502 | Advanced Software Technology & Management Research Institute of KYOTO | 123K | 7 | 0 | 1 | 1 |
| AS131159 | Yamagata University | 123K | 6 | 1 | 2 | 0 |
| AS7516 | TOHKnet Co.,Inc. | 119K | 9 | 1 | 7 | 1 |
| AS24572 | Yahoo Japan | 119K | 4 | 1 | 4 | 1 |
| AS17707 | AS for DATAHOTEL, which is one of iDC in Japan, | 119K | 23 | 4 | 3 | 0 |
| AS3488 | Japan Aerospace Exploration Agency | 117K | 13 | 0 | 1 | 0 |
| AS17514 | Otsuka Corp. | 115K | 67 | 1 | 7 | 0 |
| AS2526 | Hitachi, Ltd. IT strategy & Digital Integration Division, Employee Experience Office | 113K | 9 | 0 | 1 | 0 |
| AS10021 | KVH Co.,Ltd | 111K | 45 | 4 | 1 | 13 |
| AS4711 | INTEC Inc. | 109K | 20 | 1 | 8 | 0 |
| AS17686 | ACCELIA | 107K | 18 | 1 | 9 | 2 |
Registration country comes from the regional registries' delegation files. A network registered here may announce space used anywhere.